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D. A. QUIGGIN'. EVAPORATOR.

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D. A. QUI'GGIN.

EVAPORATOR.

NQ. 571,242. i I Patented Nov. 10, 1896.

lhvirnn raras DANIEL A. QUIGGIN, OF BLUNDELL SANDS, ENGLAND.

EVAPO RATO R.

SPECIFICATION forming partof Letters Patent No. 571,242, dated November 10, 1896.

Application filed March 16, 1896. Serial No. 588,468. (No model.)

To all whom it' may concern:

Be it known that I, DANIEL ARTHUR QUIG- GIN, a subject of the Queen of Great Britain, residing in Blundell Sands, near Liverpool, in the county of Lancaster, England, have .invented certain new and useful Improvements in Evaporators, Condensers, and the Like, of which the following is a specification.

This invention has reference more particularly to the connections of the coils which form the heat-transmitting surfaces of evaporators, condensers, and the like, the objects being to insure that the steam shall pass equally through each of the said coils and to so connect the coils to the steam-supply pipe and to the outlet by means of passages formed in the door of the apparatus that the coils and door may be easily removed without breaking the joints between them or disturbing the supplypipe or the outlet-pipe.

A further object of my invention is to provide for the testing and scaling of the coils when outside the evaporator but connected to the steam supply.

I will describe my invention as applied to evaporators and in reference to the accompanying drawings; but it will be understood that it is equally applicable to condensers, heaters, and the like.

In the drawings, Figure I is a front elevation; Fig. II, a side elevation; Fig. III, a sectional elevation on the line A A of Fig. IV. Fig. IV is a plan in section on the line B B of Fig. III,with the coils in position in the evaporator. Fig. V is a similar plan with the coils in position for testing; and FigsVLVILVIII,

Y and IX are detail views.

1 is the evaporator-shell, which in the en ample illustrated is constructed of cast-iron, but which for heavy pressures is usually made of steel. lVithin the evaporator are heattransmitting coils 2, and steam from the boiler is led to these coils through the stop-valve 3, the connecting-pipe `4L, the passage 5 in the door 6,and the pipe 7, to which the upper ends of the coils are attached. The lower ends of the coils are attached to the double pipe S, which in turn is connected to the passage 9 in the door. The steam as it passes through the coils heats the Water in the evaporator and is condensed thereby, and the water so formed is led to the drain-cock 10 through the passage 9.

The evaporator is fed with the Water to be evaporated through the feed-check valve 1l, and the vapor formed is led away through the vapor-outlet valve 12. The evaporator is iitted with a safety-valve 13, gage-glass 14, a blowoff cock 15, and baffle-plate 21.

I will now describe the mode of connecting the coils to the steam supply. rlhe upper ends of the coils are connected to nipples formed on the pipe 7, the mode of j ointing being that described in the speciiication to Letters Patent granted to me numbered 434,804, and dated August 19, 1890, and the lower ends of the coils are similarly jointed to a pipe S of special construction.

I have found that if single pipes, such as 7, be used both for the top and bottom of the coils the steam passes in greater quantity through those coils whose openings into the pipes are nearest to the inlet and outlet, and that therefore the coils whose openings into the pipes are more remote from the inlet and outlet Ydo not receive the proper proportion of steam, that is to say, the steam passes chiefly by the paths of least resistance. With a view to overcome this difficulty I make one or both of the pipes double, as shown in the case of the pipe 8 in Fig. III, and I connect the lower end of the coil Whose upper end is nearest the inlet to the portion of the outletpipe correspondingly remote from the outlet end thereof, and I connect the lower end of the coil whose upper end is most remote from the outlet to a portion of the outlet-pipe cor-- respondingly near the outlet end thereof. lVhere there are intermediate coils they are connected in a corresponding manner, with the result that the several parallel paths open to the steam through the respective coils each offer the same resistance and consequently have the same quantity of steam passing through them. By making one or both of the pipes double, as described, it will be seen that it is possible to effect the described arrangement ofv the coils Without having to place any of them obliquely.

It is necessary in apparatus of this class to provide for the Withdrawal of the coils for the purpose of cleaning, dac. ,and it is of course IOO desirable that as few joints as possible shall. be broken when. the coils are witlnlrawn. I therefore make the opening in the shell large enough to allow the coils to be withdrawn en block without disturbing the connections of the coils to the pipes 7 and 8 or the connections of the latter to the door. lVith this object in view I carry the passages 5 and 9 to the side of the door and make the joint between these passages and the inlet and outlet pipes on an overhanging portion of the door, as shown in the drawings. This construction enables me to make the joint between the passages and their connecting-pipes quite independently of the joint between the door and the evaporator-shell.

The mode of coupling the valve 3 to the passage 5 is shown in detail in FigVI. The coup-A ling-pipe 4 is attached to the valve f3 by the flange 1G and to the door by the flange 17, the jointing-surface in each case consisting, as described in my specification referred to, of concentric V-grooves, one set formed on the valve or door, as the case may be, and the other set on the union-piece 1S.

In Figui/III a modification is shown in which union-nuts if) are used instead of the flanges 1G and 17.

In Figs. VI and VVII the door is of gun-metal, but doors of cast-iron are often employed, in which case the joint is not made between the union-piece 1S and the cast-iron, but between the former and a gun-metal nozzle 20. rlhis is shown in Fig. VIII;

Fig. IX shows the mode of connecting the coil-pipes 7 and 8 to their respective passages.

Figs. V I to IX are in each case medial sections through the pipe.

It will be seen from the foregoing description that the door, with the pipes 7 and 8 and the coils in position thereon, may be removed from the evaporator by simply breaking the joints between the supply and outlet pipes and the door, and that inasmuch as the j ointing surface is behind the door the latter and the coils may be removed without interfering with the supply and outlet pipes.

I have found it of considerable advantage to be able to connect the coils to the steam supply while the coils are outside the evaporator, as this admits of the coils being tested and thoroughly inspected when under steampressure, and it will be seen that in the construction described this can readily be done, as shown in Fig. V. The door with the coils in position is removed, (usually by means of a crane attached to the evaporator,) the steam of course being cut off. The connecting-pipe et is then turned through a right angle relatively to the stop-cock and the door (susl pended .in the crane in the position shown in Fig. V) jointed to the stop-cock. In addition to the advantage of being able to test the coils when under steam the arrangement has the further advantage that the coils can be conveniently scaled by alternately turning on the steam-pressure and pouring cold water on them when in the position shown in Fig. V. The alternate expansion and contraction thus produced detaches the scale.

I claiml. In an evaporator, condenser or the like, a shell, a series of coils within the same, an inlet-pipe and an outlet-pipe, said coils being disposed at different points along the said pipes, one of the pipes having a circuitous passage through it to cause the steam to pass equally through the several coils, substantially as described.

In combination, a shell, coils within the same, an inlet and an outlet pipe, said coils being disposed at different points along the same, and one of said pipes being of double form, providing a circuitous passage therein to cause the steam to pass equally through the several coils, substantially as described.

El. In an evaporator, the combination of the shell, the removable door, the upper and lower pipes projecting' into the shell therefrom, the coils extending between said pipes, the pipes 5 and 9 extending from the upper and lower centers of the door laterally to one side thereof and the inlet and outlet pipes at the side of the shell and connecting with the pipes 5 and ilindependently of the shell, said connection including a hollow hinge-joint to allow the water to pass substantially as described.

4. In combination, the shell, the removable door having the upper and lower pipes 7 and S with the heating-coils carried thereby, the pipes 5 and 9 on the door extending laterally thereof to one edge, the inlet-pipe at the side of the shell and at the rear of the door, and the jointed connection between the inlet-pipe and the pipe 5 comprising the curved pipe i arranged to swivel in its support, and forming with said support a hollow hinge-joint for the free passage of the water therethrough substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

I). A. QUIGGIN.

Witnesses:

CHARLEs COLLINs, J. E. LLOYD BARNEs. 

